Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3b02a1057f0cd0…

MALICIOUS

PDF

77.6 KB Created: 2021-08-03 17:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65d0a1111a39e130292bb8dc397404a2 SHA-1: 46de7f489eb5b7be01b093d3e3ff33ab5dd9f023 SHA-256: 8a3b02a1057f0cd0c22a023ef48b965ec38f2a14ddf17261389b7aba2b423551
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=practical+finite+element+analysis+nitin+s+gokhale+pdf+download
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/532fead6cb7c5077bd058ffedfa16ee6/rogorovorifeliji.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20fdce95e---sijilenekodazememibumew.pdf
    • https://kanat.com/upload/ckfinder/files/gemopupuro.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3d40ef582---92239086177.pdf
    • http://biomassasia.net/data_ed/userfiles/file/65926206888.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e16c1529cd43006b053ad4609a1b014f/18810494290.pdf
    • http://grandparkoptimum.com/ckfinder/userfiles/files/vobinujawaxekimapezen.pdf
    • http://trunglam.vn/uploads/userfiles/file/493677240.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d03a42ec6a89cc82b90a9ffcf89f8422/66370158237.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160967ed76c1e2---wusinokumu.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/vanepage.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j85i7513un3kd1mauq4afj71aa/bujirub.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76459e3f9---fetematazorowuxa.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d44e7bd7---95541757492.pdf
    • http://llux.vn/uploads/files/pusimudisukuwumejazajomi.pdf
    • https://malashealthcare.com/userfiles/files/83301998251.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbe535da4---votafuximola.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd7bca895---25212662817.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb088a193d---60929064587.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/02bcaa4d12e99f8482b392ec3d894bc1/galegudotekil.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbfdbb9d4---36076084523.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90bc392d0---rulokosokitarowupozovafon.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb9861834b---18275284370.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 16792 bytes
font_01_sfnt_off0000e0e1.bin
93999994d12c6c7c84daecf7ce1ff07c5c6651d3618c361cdac028298c99a497		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 17124 bytes
font_02_sfnt_off00010d02.bin
9aba6bb9ea9c051580b93df1169450e2bc4e6b84990772ab46e39c819ff4448c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 11360 bytes

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